TW202216463A - Transparent piezoelectric laminated film and touch panel - Google Patents
Transparent piezoelectric laminated film and touch panel Download PDFInfo
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- TW202216463A TW202216463A TW110139472A TW110139472A TW202216463A TW 202216463 A TW202216463 A TW 202216463A TW 110139472 A TW110139472 A TW 110139472A TW 110139472 A TW110139472 A TW 110139472A TW 202216463 A TW202216463 A TW 202216463A
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- transparent
- film
- transparent piezoelectric
- piezoelectric
- coating layer
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Abstract
Description
本發明係關於一種透明壓電積層膜及觸控面板。The present invention relates to a transparent piezoelectric laminated film and a touch panel.
透明壓電積層膜係根據壓力而產生電氣且可特定出被施加壓力之位置，因此可用於觸控面板之壓力感測器。The transparent piezoelectric laminated film generates electricity according to the pressure and can specify the position where the pressure is applied, so it can be used for the pressure sensor of the touch panel.
關於此種透明壓電積層膜，已知有具有作為氟樹脂之偏二氟乙烯-四氟乙烯共聚物的透明壓電積層片（例如參照專利文獻1）。另外，關於該透明壓電積層膜，已知有可在透明壓電積層膜中用於層間黏接之含有特定抗氧化劑的丙烯酸系光學用黏著片（例如參照專利文獻2）。 習知技術文獻 專利文獻 Regarding such a transparent piezoelectric laminated film, a transparent piezoelectric laminated sheet including a vinylidene fluoride-tetrafluoroethylene copolymer as a fluororesin is known (for example, refer to Patent Document 1). Moreover, regarding this transparent piezoelectric laminated film, the acrylic adhesive sheet for optical use containing a specific antioxidant which can be used for interlayer adhesion in a transparent piezoelectric laminated film is known (for example, refer patent document 2). Known technical literature Patent Literature
專利文獻1：日本專利特開2010-108490號公報 專利文獻2：日本專利特開2011-168688號公報 Patent Document 1: Japanese Patent Laid-Open No. 2010-108490 Patent Document 2: Japanese Patent Laid-Open No. 2011-168688
發明欲解決之課題The problem to be solved by the invention
透明壓電膜通常於透明壓電積層膜中使用如上述之透明光學用黏著片黏接於其他層而使用。另外，透明壓電積層膜之光學特性較佳為實質上固定。然而，若將氟樹脂製透明壓電膜與如上述之黏著片貼合，該透明壓電膜會有隨時間變黃之情況。尤其是於高溫高濕環境下，上述透明壓電膜之變色更顯著。如此，對於習知技術，就防止氟樹脂製透明壓電膜之變色之觀點而言尚有研究餘地。The transparent piezoelectric film is usually used by adhering to other layers using the above-mentioned transparent optical adhesive sheet in the transparent piezoelectric laminated film. In addition, the optical properties of the transparent piezoelectric multilayer film are preferably substantially constant. However, when the transparent piezoelectric film made of fluororesin is bonded to the above-mentioned adhesive sheet, the transparent piezoelectric film may turn yellow with time. Especially in the high temperature and high humidity environment, the discoloration of the above-mentioned transparent piezoelectric film is more remarkable. As described above, there is still room for research from the viewpoint of preventing the discoloration of the transparent piezoelectric film made of fluororesin in the prior art.
本發明之一實施方式之目的在於實現防止具有氟樹脂製透明壓電膜之透明壓電積層膜中之透明壓電膜的變色。 解決問題之技術手段 An object of one embodiment of the present invention is to prevent discoloration of the transparent piezoelectric film in the transparent piezoelectric multilayer film having the transparent piezoelectric film made of fluororesin. technical means to solve problems
為了解決上述課題，本發明之一實施方式之透明壓電積層膜係依序重疊氟樹脂製透明壓電膜、具有0.20 µm以上之厚度之透明塗佈層、以及透明黏著劑層而構成。In order to solve the above-mentioned problems, a transparent piezoelectric laminated film according to an embodiment of the present invention is constituted by sequentially stacking a transparent piezoelectric film made of fluororesin, a transparent coating layer having a thickness of 0.20 µm or more, and a transparent adhesive layer.
為了解決上述課題，本發明之一實施方式之觸控面板具有上述透明壓電積層膜。 發明效果 In order to solve the above-mentioned problems, a touch panel according to an embodiment of the present invention includes the above-mentioned transparent piezoelectric laminate film. Invention effect
根據本發明之一實施方式，可防止具有氟樹脂製透明壓電膜之透明壓電積層膜中之透明壓電膜的變色。According to one embodiment of the present invention, discoloration of the transparent piezoelectric film in the transparent piezoelectric multilayer film having the transparent piezoelectric film made of fluororesin can be prevented.
[構成][constitute]
本發明之一實施方式之透明壓電積層膜係依序重疊透明壓電膜、透明塗佈層以及透明黏著劑層而構成。本實施方式中，「依序重疊」係指於包含上述膜及層之積層物中該膜及層以列舉出之順序配置之狀態。於發揮本實施方式之效果之範圍內，上述膜及層可相接地重疊，亦可隔著其他膜或層而重疊。 [透明壓電膜] The transparent piezoelectric laminated film of one embodiment of the present invention is formed by sequentially stacking a transparent piezoelectric film, a transparent coating layer, and a transparent adhesive layer. In the present embodiment, "sequentially overlapping" refers to a state in which the films and layers are arranged in the order listed in the laminate including the above-mentioned films and layers. As long as the effect of this embodiment is exhibited, the above-mentioned films and layers may be overlapped with each other, or may be overlapped with other films or layers interposed therebetween. [Transparent Piezo Film]
本實施方式中之透明壓電膜為氟樹脂製。於本實施方式中，「氟樹脂製」係指於構成透明壓電膜之組合物中氟樹脂為主成分，「氟樹脂為主成分」係指於該組合物中氟樹脂為樹脂成分中最多之成分。該組合物中之氟樹脂之含量可為51質量%以上，可為80質量%以上，亦可為100質量%。The transparent piezoelectric film in this embodiment is made of fluororesin. In this embodiment, "made of fluororesin" means that the fluororesin is the main component in the composition constituting the transparent piezoelectric film, and "the main component of fluororesin" means that the fluororesin is the most resin component in the composition the ingredients. The content of the fluororesin in the composition may be 51% by mass or more, 80% by mass or more, or 100% by mass.
另外，「壓電膜」係指具有壓電性之膜。另外，本實施方式中，「透明」係指讓與透明壓電積層膜之用途相應之所需比率以上的可見光透過之光學特性。In addition, "piezoelectric film" refers to a film having piezoelectricity. In addition, in this embodiment, "transparency" means the optical characteristic which transmits the visible light more than the required ratio according to the application of a transparent piezoelectric laminated film.
本實施方式中之氟樹脂可為能用於壓電膜之任意氟樹脂，可為一種亦可為一種以上。該氟樹脂之示例中包含偏二氟乙烯樹脂、四氟乙烯樹脂及該等之混合物。The fluororesin in this embodiment may be any fluororesin that can be used for the piezoelectric film, and may be one type or more than one type. Examples of the fluororesin include vinylidene fluoride resin, tetrafluoroethylene resin, and mixtures thereof.
偏二氟乙烯樹脂之示例中包含偏二氟乙烯之均聚物及其共聚物。偏二氟乙烯之共聚物中源自偏二氟乙烯以外之單體之結構單元的含量可於能表現出與透明壓電積層膜之用途相應之特性的範圍內適當決定。Examples of vinylidene fluoride resins include vinylidene fluoride homopolymers and copolymers thereof. The content of the structural units derived from monomers other than vinylidene fluoride in the copolymer of vinylidene fluoride can be appropriately determined within a range capable of exhibiting properties according to the application of the transparent piezoelectric multilayer film.
偏二氟乙烯之共聚物中之偏二氟乙烯以外之單體的示例中，包含烴系單體及氟化合物。該烴系單體之示例中包含乙烯及丙烯。該氟化合物為偏二氟乙烯以外之氟化合物，且為具有聚合性結構之氟化合物。該氟化合物之示例中包含氟乙烯、三氟乙烯、三氟氯乙烯、四氟乙烯、六氟丙烯及氟烷基乙烯基醚。Examples of monomers other than vinylidene fluoride in the copolymer of vinylidene fluoride include hydrocarbon-based monomers and fluorine compounds. Examples of the hydrocarbon-based monomer include ethylene and propylene. The fluorine compound is a fluorine compound other than vinylidene fluoride, and is a fluorine compound having a polymerizable structure. Examples of the fluorine compound include vinyl fluoride, trifluoroethylene, chlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene, and fluoroalkyl vinyl ether.
四氟乙烯樹脂之示例中包含四氟乙烯之均聚物及其共聚物。構成該共聚物之結構單元之四氟乙烯以外之單體的示例中，包含乙烯、氟丙烯、氟烷基乙烯基醚、全氟烷基乙烯基醚及全氟二氧雜環戊烯。Examples of tetrafluoroethylene resins include tetrafluoroethylene homopolymers and copolymers thereof. Examples of monomers other than tetrafluoroethylene constituting the structural unit of the copolymer include ethylene, fluoropropylene, fluoroalkyl vinyl ether, perfluoroalkyl vinyl ether, and perfluorodioxol.
本實施方式中之透明壓電膜可於獲得本實施方式之效果之範圍內含有各種添加劑。該添加劑可為一種亦可為一種以上，其示例中包含塑化劑、潤滑劑、交聯劑、紫外線吸收劑、pH值調整劑、穩定劑、抗氧化劑、界面活性劑及顏料。The transparent piezoelectric film in this embodiment may contain various additives within the range in which the effects of this embodiment are obtained. The additives may be one or more than one, and examples thereof include plasticizers, lubricants, cross-linking agents, ultraviolet absorbers, pH adjusters, stabilizers, antioxidants, surfactants and pigments.
本實施方式中之透明壓電膜之厚度可根據透明壓電積層膜之用途，自獲得本實施方式之效果之範圍內適當決定。透明壓電膜之厚度若過薄，則存在機械強度不足之情況，若過厚，則存在效果有限，或透明性不足而難以用於光學用途之情況。The thickness of the transparent piezoelectric film in this embodiment mode can be appropriately determined within a range in which the effects of this embodiment mode are obtained according to the application of the transparent piezoelectric laminated film. If the thickness of the transparent piezoelectric film is too thin, the mechanical strength may be insufficient, and if the thickness is too thick, the effect may be limited, or the transparency may be insufficient and it may be difficult to use for optical applications.
就充分表現出壓電性及機械強度之觀點而言，透明壓電膜之厚度較佳為10 µm以上，更佳為20 µm以上，進一步較佳為30 µm以上。而且，就充分表現出透明性及壓電性之觀點而言，透明壓電膜之厚度較佳為200 µm以下，更佳為120 µm以下，進一步較佳為80 µm以下。From the viewpoint of sufficiently expressing piezoelectricity and mechanical strength, the thickness of the transparent piezoelectric film is preferably 10 µm or more, more preferably 20 µm or more, and further preferably 30 µm or more. Furthermore, from the viewpoint of sufficiently expressing transparency and piezoelectricity, the thickness of the transparent piezoelectric film is preferably 200 µm or less, more preferably 120 µm or less, and further preferably 80 µm or less.
本實施方式中之透明壓電膜之壓電特性可根據透明壓電積層膜之用途，自獲得本實施方式之效果之範圍內適當決定。若壓電特性過低，則存在作為壓電材料之功能不足之情況。就表現出充分之壓電特性之觀點而言，例如透明壓電積層膜為觸控面板時，透明壓電膜之壓電特性以壓電常數d 33計較佳為6 pC/N以上，更佳為10 pC/N以上，進一步較佳為12 pC/N以上。該壓電特性之上限並無限定，於上述情形時，就充分獲得所需效果之觀點而言，以壓電常數d 33計為30 pC/N以下即可。 The piezoelectric properties of the transparent piezoelectric film in this embodiment mode can be appropriately determined within a range in which the effects of this embodiment mode are obtained according to the application of the transparent piezoelectric laminated film. If the piezoelectric characteristics are too low, the function as a piezoelectric material may be insufficient. From the viewpoint of exhibiting sufficient piezoelectric properties, for example, when the transparent piezoelectric multilayer film is a touch panel, the piezoelectric properties of the transparent piezoelectric film are preferably 6 pC/N or more in terms of piezoelectric constant d33 , more preferably It is 10 pC/N or more, more preferably 12 pC/N or more. The upper limit of the piezoelectric characteristics is not limited, but in the above case, from the viewpoint of sufficiently obtaining the desired effect, the piezoelectric constant d 33 may be 30 pC/N or less.
本實施方式中之透明壓電膜可如實施例中所記載藉由氟樹脂片之延伸及極化處理而製造。於該製造時，就提高透明壓電膜之透明性之觀點而言，較佳為使之足夠薄為前述厚度。另外，於該製造中進行輥延伸時，就防止透明壓電膜之表面上之損傷，且提高透明壓電膜之透明性之觀點而言，較佳為使用經過鏡面加工之輥或使用保護膜（例如參照日本專利特開2019-67908號公報）。 [透明塗佈層] The transparent piezoelectric film in this embodiment can be manufactured by extending and polarizing the fluororesin sheet as described in the examples. In this production, from the viewpoint of improving the transparency of the transparent piezoelectric film, it is preferable to make it sufficiently thin to the aforementioned thickness. In addition, it is preferable to use a mirror-finished roll or a protective film from the viewpoint of preventing damage on the surface of the transparent piezoelectric film and improving the transparency of the transparent piezoelectric film when performing roll stretching in this production. (For example, refer to Japanese Patent Laid-Open No. 2019-67908). [Clear coating layer]
本實施方式中之透明塗佈層位於透明壓電膜與透明黏著劑層之間。透明塗佈層只要為透明，且不會對透明壓電膜之光學特性產生實質影響之具有惰性的層即可。透明塗佈層可僅配置於透明壓電膜之一表面側，亦可配置於兩面側。將透明塗佈層形成於透明壓電膜之兩面時，兩透明塗佈層可具有相同組成、厚度以及物性，亦可具有不同組成、厚度以及物性。將透明塗佈層形成於透明壓電膜之兩面時，較佳為至少一透明塗佈層具有後述透明塗佈層之較佳構成，更佳為兩透明塗佈層均具有後述透明塗佈層之較佳構成。就防止前述透明壓電膜著色之觀點而言，透明塗佈層較佳為於透明壓電積層膜之厚度方向上與透明壓電膜鄰接配置。The transparent coating layer in this embodiment is located between the transparent piezoelectric film and the transparent adhesive layer. The transparent coating layer may be an inert layer that is transparent and does not substantially affect the optical properties of the transparent piezoelectric film. The transparent coating layer may be arranged only on one surface side of the transparent piezoelectric film, or may be arranged on both sides. When the transparent coating layers are formed on both sides of the transparent piezoelectric film, the two transparent coating layers may have the same composition, thickness and physical properties, or may have different compositions, thicknesses and physical properties. When the transparent coating layers are formed on both sides of the transparent piezoelectric film, preferably at least one transparent coating layer has the preferred structure of the transparent coating layer described later, and more preferably both transparent coating layers have the transparent coating layer described later. the preferred composition. From the viewpoint of preventing coloration of the transparent piezoelectric film, the transparent coating layer is preferably disposed adjacent to the transparent piezoelectric film in the thickness direction of the transparent piezoelectric multilayer film.
本實施方式中之透明塗佈層之厚度可於獲得本實施方式之效果之範圍內適當決定。若透明塗佈層過薄，則存在透明塗佈層無法充分覆蓋透明壓電膜之表面之情況，有形成透明壓電膜自透明塗佈層露出之部分之情況。若透明塗佈層過厚，則有透明壓電積層膜之壓電性不足之情況。The thickness of the transparent coating layer in this embodiment can be appropriately determined within the range in which the effects of this embodiment are obtained. If the transparent coating layer is too thin, the transparent coating layer may not sufficiently cover the surface of the transparent piezoelectric film, and a portion of the transparent piezoelectric film exposed from the transparent coating layer may be formed. If the transparent coating layer is too thick, the piezoelectricity of the transparent piezoelectric laminate film may be insufficient.
就充分覆蓋透明壓電膜之表面之觀點而言，透明塗佈層之厚度較佳為0.20 µm以上，更佳為0.25 µm以上，進一步較佳為0.30 µm以上。而且，就充分顯現透明壓電膜之壓電特性之觀點而言，透明塗佈層之厚度較佳為4.0 µm以下，更佳為3.5 µm以下，進一步較佳為3.0 µm以下。From the viewpoint of sufficiently covering the surface of the transparent piezoelectric film, the thickness of the transparent coating layer is preferably 0.20 µm or more, more preferably 0.25 µm or more, and still more preferably 0.30 µm or more. Furthermore, from the viewpoint of sufficiently expressing the piezoelectric properties of the transparent piezoelectric film, the thickness of the transparent coating layer is preferably 4.0 µm or less, more preferably 3.5 µm or less, and still more preferably 3.0 µm or less.
透明塗佈層可為亦被稱為所謂硬塗層之用於防止損傷的透明表面保護層。透明塗佈層之材料可於具有前述透明性及對於透明壓電膜之上述惰性之範圍內，自可用於壓電膜之任意材料中選擇。該材料可為無機材料亦可為有機材料，可為一種亦可為一種以上。另外，該塗佈層之材料亦可為硬塗層之材料。該材料之示例中包含三聚氰胺樹脂、胺基甲酸酯樹脂、(甲基)丙烯酸酯樹脂、矽烷化合物及金屬氧化物。另外，「(甲基)丙烯酸」為丙烯酸及甲基丙烯酸之統稱，且係指該等之其中一者或兩者。The clear coat layer may be a transparent surface protective layer for preventing damage, also known as a so-called hard coat layer. The material of the transparent coating layer can be selected from any materials that can be used for piezoelectric films within the range of having the aforementioned transparency and the aforementioned inertness to the transparent piezoelectric film. The material can be either an inorganic material or an organic material, one kind or more than one kind. In addition, the material of the coating layer can also be the material of the hard coat layer. Examples of such materials include melamine resins, urethane resins, (meth)acrylate resins, silane compounds, and metal oxides. In addition, "(meth)acrylic acid" is a general term for acrylic acid and methacrylic acid, and refers to one or both of them.
就表現出充分之透明性及透明壓電膜之充分之屏障功能的觀點、以及材料種類之豐富性及原料價格之低廉性的觀點而言，較佳為透明塗佈層之材料為(甲基)丙烯酸酯樹脂，即透明塗佈層為(甲基)丙烯酸酯樹脂製。透明塗佈層之材料亦可含有構成透明塗佈層所需之其他材料。為(甲基)丙烯酸酯樹脂製透明塗佈層之材料時，通常可使用起始劑、低聚物、單體及其他成分混合而成之組合物。此時，透明塗佈層之物性主要由低聚物及單體決定。該低聚物之示例中包含單官能或多官能之(甲基)丙烯酸酯。上述單體之示例中包含胺基甲酸酯(甲基)丙烯酸酯、環氧(甲基)丙烯酸酯、聚酯(甲基)丙烯酸酯。From the viewpoints of exhibiting sufficient transparency and a sufficient barrier function of the transparent piezoelectric film, and from the viewpoints of richness of material types and low cost of raw materials, it is preferable that the material of the transparent coating layer is (methyl) ) acrylate resin, that is, the clear coating layer is made of (meth)acrylate resin. The material of the clear coating layer may also contain other materials required for forming the clear coating layer. In the case of a material for a clear coating layer made of a (meth)acrylate resin, a composition in which an initiator, an oligomer, a monomer and other components are mixed can usually be used. At this time, the physical properties of the clear coating layer are mainly determined by oligomers and monomers. Examples of such oligomers include monofunctional or polyfunctional (meth)acrylates. Examples of the above monomers include urethane (meth)acrylate, epoxy (meth)acrylate, polyester (meth)acrylate.
透明塗佈層可於表現出本實施方式之效果之範圍內具有各種功能。透明塗佈層之材料亦可進一步含有用於表現出任意功能之材料作為其他成分。此種材料之示例中包含用於控制透明塗佈層之折射率之光學調整劑及抗靜電劑。光學調整劑之示例中包含中空二氧化矽系微粒子、矽烷偶合劑、氧化矽、氧化鋁、氧化鈦、氧化鋯、氧化鋅及氧化錫。抗靜電劑之示例中包含界面活性劑、五氧化銻、氧化銦錫及導電性高分子。 [透明黏著劑層] The clear coating layer can have various functions within the range in which the effects of the present embodiment are exhibited. The material of the clear coating layer may further contain materials for expressing arbitrary functions as other components. Examples of such materials include optical modifiers and antistatic agents for controlling the refractive index of the clear coating layer. Examples of the optical adjustment agent include hollow silica-based fine particles, silane coupling agents, silica, alumina, titania, zirconia, zinc oxide, and tin oxide. Examples of antistatic agents include surfactants, antimony pentoxide, indium tin oxide, and conductive polymers. [Transparent adhesive layer]
本實施方式中之透明黏著劑層係具有可黏接透明壓電膜與透明塗佈層之積層膜之黏著性且形成於透明塗佈層側的透明層。The transparent adhesive layer in this embodiment is a transparent layer formed on the side of the transparent coating layer, which has adhesiveness capable of bonding the laminated film of the transparent piezoelectric film and the transparent coating layer.
透明黏著劑層之材料可自能用於透明積層膜之任意材料中選擇。該材料可為無機材料亦可為有機材料，可為一種亦可為一種以上。該材料之示例中包含丙烯酸樹脂系黏著劑、橡膠系黏著劑、矽酮系黏著劑、聚酯系黏著劑、聚胺基甲酸酯系黏著劑、聚醯胺系黏著劑、環氧樹脂系黏著劑、聚乙烯基烷基醚系黏著劑、及氟樹脂系黏著劑。The material of the transparent adhesive layer can be selected from any materials that can be used for transparent laminated films. The material can be either an inorganic material or an organic material, one kind or more than one kind. Examples of the material include acrylic resin based adhesives, rubber based adhesives, silicone based adhesives, polyester based adhesives, polyurethane based adhesives, polyamide based adhesives, epoxy based adhesives Adhesives, polyvinyl alkyl ether-based adhesives, and fluororesin-based adhesives.
其中，丙烯酸樹脂系黏著劑之透明性優異，且藉由聚合容易進行分子量及交聯點之操作。而且，成為原料之單體之種類豐富，可自由控制玻璃轉移點。觸控面板用黏著劑通常要求有透明性、耐候性、耐久性等各種特性。因此，具有此種較佳特性之上述丙烯酸樹脂系黏著劑適宜作為本實施方式中之透明黏著劑層之材料。Among them, acrylic resin-based adhesives are excellent in transparency, and the molecular weight and cross-linking point can be easily manipulated by polymerization. In addition, the types of monomers used as raw materials are abundant, and the glass transition point can be freely controlled. Adhesives for touch panels are generally required to have various properties such as transparency, weather resistance, and durability. Therefore, the above-mentioned acrylic resin-based adhesive having such preferable characteristics is suitable as the material of the transparent adhesive layer in this embodiment.
丙烯酸樹脂系黏著劑係由彈性體等丙烯酸系單體之高分子構成。成為丙烯酸樹脂系黏著劑之結構單元之來源的單體含有有助於黏著劑之基本性能之主單體，亦可進一步含有用於提高功能之共聚單體及用於導入交聯點之含官能基單體。主單體之示例中包含丙烯酸乙酯、丙烯酸丁酯、丙烯酸2-乙基己酯及丙烯酸異壬酯。於共聚單體中，例如用於提高黏著劑之凝聚力之共聚單體之示例中包含乙酸乙烯酯、丙烯腈、丙烯醯胺、苯乙烯、甲基丙烯酸甲酯及丙烯酸甲酯。含官能基單體之示例中包含丙烯酸、丙烯酸羥乙酯、丙烯醯胺及甲基丙烯酸縮水甘油酯。Acrylic resin adhesives are composed of polymers of acrylic monomers such as elastomers. The monomer that becomes the source of the structural unit of the acrylic resin adhesive contains the main monomer that contributes to the basic performance of the adhesive, and may further contain a comonomer for improving the function and a functional-containing monomer for introducing a cross-linking point. base monomer. Examples of main monomers include ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and isononyl acrylate. Among the comonomers, examples of comonomers such as those used to improve the cohesion of the adhesive include vinyl acetate, acrylonitrile, acrylamide, styrene, methyl methacrylate, and methyl acrylate. Examples of functional group-containing monomers include acrylic acid, hydroxyethyl acrylate, acrylamide, and glycidyl methacrylate.
另外，矽酮系黏著劑之示例中包含作為紫外線固化型光學黏接矽酮之LUMISIL系列（「LUMISIL」為瓦克化學公司之註冊商標）及作為矽高透明黏著片之ISR-SOC系列。In addition, examples of silicone-based adhesives include the LUMISIL series (“LUMISIL” is a registered trademark of Wacker Chemie), which are UV-curable optical adhesive silicones, and the ISR-SOC series, which are high-silicon transparent adhesive sheets.
上述丙烯酸樹脂系黏著劑雖透明性及黏著性等各特性優異，但與前述透明壓電膜接觸時有使該透明壓電膜黃變之情況。本實施方式中，即便透明黏著劑層為丙烯酸樹脂系黏著劑，於透明黏著劑層與透明壓電膜之間亦隔著前述透明塗佈層。因此，可防止認為是由丙烯酸樹脂系黏著劑引起之透明壓電膜之經時黃變。Although the said acrylic resin adhesive is excellent in each characteristic, such as transparency and adhesiveness, when it contacts with the said transparent piezoelectric film, the said transparent piezoelectric film may turn yellow. In this embodiment, even if the transparent adhesive layer is an acrylic resin-based adhesive, the transparent coating layer is interposed between the transparent adhesive layer and the transparent piezoelectric film. Therefore, the yellowing of the transparent piezoelectric film over time, which is thought to be caused by the acrylic resin-based adhesive, can be prevented.
判斷透明黏著劑層之透明黏著劑之物性的指標之一包含玻璃轉移溫度。其為黏著劑自橡膠狀態向玻璃狀態（或者相反地）轉移時之溫度。對於丙烯酸樹脂系黏著劑，通常根據成為基礎之聚合物（例如前述主單體所構成之聚合物等）之玻璃轉移溫度來決定表現出黏著性之溫度區域。透明黏著劑層之玻璃轉移溫度只要根據上述所需黏著性及表現出該黏著性之溫度而適當決定即可。對於黏著劑，通常可藉由交聯之導入來提高黏著性，交聯之導入亦會使玻璃轉移溫度發生變化，通常會變高。利用此種黏著劑之分子結構或者藉由混合兩種以上之樹脂，可適當調整玻璃轉移溫度。透明黏著劑層之玻璃轉移溫度可使用能測定出積層膜中各層之玻璃轉移溫度之公知方法來測定。One of the indexes for judging the physical properties of the transparent adhesive of the transparent adhesive layer includes the glass transition temperature. It is the temperature at which the adhesive transfers from the rubbery state to the glassy state (or vice versa). In the case of acrylic resin-based adhesives, the temperature range in which the adhesiveness is exhibited is usually determined according to the glass transition temperature of the underlying polymer (for example, the polymer composed of the aforementioned main monomer). The glass transition temperature of the transparent adhesive layer may be appropriately determined according to the above-mentioned required adhesiveness and the temperature at which the adhesiveness is exhibited. For adhesives, the adhesion can usually be improved by the introduction of cross-linking, and the introduction of cross-linking will also change the glass transition temperature, which usually increases. The glass transition temperature can be properly adjusted by using the molecular structure of the adhesive or by mixing two or more resins. The glass transition temperature of the transparent adhesive layer can be measured using a known method capable of measuring the glass transition temperature of each layer in a laminated film.
透明黏著劑層之厚度過薄時有黏著力不足之情況，過厚時有透明壓電積層膜之壓電特性不足之情況。就表現出充分黏著力之觀點而言，透明黏著劑層之厚度較佳為25 µm以上，更佳為30 µm以上，進一步較佳為35 µm以上。而且，就表現出透明壓電積層膜之充分壓電特性之觀點而言，透明黏著劑層之厚度較佳為200 µm以下，更佳為150 µm以下，進一步較佳為100 µm以下。 [其他層構成] If the thickness of the transparent adhesive layer is too thin, the adhesive force may be insufficient, and if the thickness is too thick, the piezoelectric properties of the transparent piezoelectric laminated film may be insufficient. From the viewpoint of exhibiting sufficient adhesive force, the thickness of the transparent adhesive layer is preferably 25 µm or more, more preferably 30 µm or more, and further preferably 35 µm or more. Furthermore, from the viewpoint of expressing sufficient piezoelectric properties of the transparent piezoelectric multilayer film, the thickness of the transparent adhesive layer is preferably 200 µm or less, more preferably 150 µm or less, and still more preferably 100 µm or less. [Other layer configuration]
本實施方式之透明壓電積層膜亦可於表現出本實施方式之效果之範圍內進一步具有前述以外之其他構成。此種其他構成可為一種亦可為一種以上，其示例中包含與前述透明黏著劑層抵接且可剝離之脫模層、光學調整層（折射率匹配層）及導電層。該光學調整層可於表現出所需性能之範圍內使用上述透明塗佈層之材料而形成。The transparent piezoelectric multilayer film of the present embodiment may further have other structures than those described above within the range in which the effects of the present embodiment are exhibited. Such other structures may be one type or more than one type, and examples thereof include a release layer, an optical adjustment layer (refractive index matching layer), and a conductive layer that are in contact with the transparent adhesive layer and can be peeled off. The optical adjustment layer can be formed using the material of the above-mentioned clear coating layer within the range that exhibits the desired properties.
另外，構成透明壓電積層膜之各層之厚度可藉由將透明壓電積層膜包埋於環氧樹脂中，以透明壓電積層膜之截面露出之方式將環氧樹脂塊切斷，利用掃描式電子顯微鏡觀察該截面而測定。該層之厚度只要為該層之厚度之代表值即可，可為任意之多個測定值之平均值，亦可為該測定值之最大值，亦可為該測定值之最小值。 [物性] In addition, the thickness of each layer constituting the transparent piezoelectric laminated film can be obtained by embedding the transparent piezoelectric laminated film in epoxy resin, cutting the epoxy resin block so that the cross-section of the transparent piezoelectric laminated film is exposed, and using scanning The cross-section was observed and measured with an electron microscope. The thickness of the layer may be a representative value of the thickness of the layer, and may be the average value of any number of measured values, the maximum value of the measured values, or the minimum value of the measured values. [physical properties]
就實現充分透光性之觀點而言，本實施方式之透明壓電積層膜較佳為足夠透明。例如，透明壓電積層膜之全光線透過率可根據該透明壓電積層膜之用途而適當決定。於觸控面板之壓力感測器之用途時，透明壓電積層膜之全光線透過率較佳為80%以上，就應用於觸控面板中配置在比顯示器更靠表面側之壓力感測器的觀點而言，更佳為83%以上。全光線透過率例如可使用霧度計，基於JIS K7361中記載之公知方法進行測定。The transparent piezoelectric laminated film of this embodiment is preferably sufficiently transparent from the viewpoint of realizing sufficient light transmittance. For example, the total light transmittance of the transparent piezoelectric laminate film can be appropriately determined according to the application of the transparent piezoelectric laminate film. In the application of the pressure sensor of the touch panel, the total light transmittance of the transparent piezoelectric laminated film is preferably more than 80%, so it is applied to the pressure sensor arranged on the surface side of the touch panel than the display. From the viewpoint of , the better is 83% or more. The total light transmittance can be measured based on the known method described in JIS K7361 using, for example, a haze meter.
另外，透明壓電積層膜之霧度值亦與全光線透過率同樣地可根據該透明壓電積層膜之用途而適當決定。於觸控面板之壓力感測器之用途時，透明壓電積層膜之霧度值較佳為1.5以下，就應用於觸控面板中配置在比顯示器更靠表面側之壓力感測器的觀點而言，更佳為1.0以下。霧度值例如可使用霧度計，基於JIS K7136中記載之公知方法進行測定。In addition, the haze value of the transparent piezoelectric laminate film can be appropriately determined according to the application of the transparent piezoelectric laminate film, similarly to the total light transmittance. In the application of the pressure sensor of the touch panel, the haze value of the transparent piezoelectric laminate film is preferably 1.5 or less, which is applied to the pressure sensor disposed on the surface side of the touch panel rather than the display. More preferably, it is 1.0 or less. The haze value can be measured based on the known method described in JIS K7136, for example, using a haze meter.
另外，透明壓電積層膜於其使用形態上有進一步具有電極層等其他層之情況。透明壓電積層膜之透明性可考慮此種使用形態下之構成而決定，但大致與透明壓電膜之透明性同等。因此，透明壓電積層膜之透明性可將加上其他層等之存在所產生之影響作為條件，根據透明壓電膜之透明性而適當決定。其他層等對於透明性之影響例如可藉由直接求出其他層等之透明性而求得，亦可根據透明壓電積層膜之透明性與透明壓電膜之透明性之差而求得。Moreover, the transparent piezoelectric laminated film may further have other layers, such as an electrode layer, in the use form. The transparency of the transparent piezoelectric multilayer film can be determined in consideration of the structure in such a use state, but is approximately equal to the transparency of the transparent piezoelectric film. Therefore, the transparency of the transparent piezoelectric multilayer film can be appropriately determined according to the transparency of the transparent piezoelectric film, taking the influence of the presence of other layers and the like as a condition. The influence of other layers and the like on the transparency can be obtained, for example, by directly obtaining the transparency of the other layers and the like, or it can be obtained from the difference between the transparency of the transparent piezoelectric laminated film and the transparency of the transparent piezoelectric film.
此外，就實現穩定之透光性之觀點而言，本實施方式之透明壓電積層膜較佳為不會變色。此種耐變色性亦可根據該透明壓電積層膜之用途而適當決定。Moreover, it is preferable that the transparent piezoelectric laminated film of this embodiment does not discolor from the viewpoint of realizing stable light transmittance. Such discoloration resistance may be appropriately determined according to the application of the transparent piezoelectric multilayer film.
若前述透明壓電膜與透明黏著劑層直接相接，則有透明壓電膜黃變之情況。該黃變之程度能以L *a *b *表色系中之ΔE值表示。例如，於所需環境中放置所需時間時之放置前後之ΔE值之差越大，表示透明壓電膜之上述黃變越明顯，ΔE值之差越小，表示透明壓電膜之上述黃變越得到抑制。上述所需環境、所需時間及ΔE值之類的光學特性值之差可根據透明壓電積層膜之用途而適當決定。如上述之色差可使用分光測色計、分光色彩計，基於JIS Z8722中記載之公知方法進行測定。另外，本實施方式中，ΔE值係利用下述式算出。ΔE表示色差。ΔL *表示放置前後L *值之差，Δa *表示放置前後a *值之差，Δb *表示放置前後b *值之差。 If the transparent piezoelectric film and the transparent adhesive layer are in direct contact with each other, the transparent piezoelectric film may turn yellow. The degree of yellowing can be expressed as the ΔE value in the L * a * b * colorimetric system. For example, the larger the difference between the ΔE values before and after placing in the required environment for the required time, the more obvious the above-mentioned yellowing of the transparent piezoelectric film, and the smaller the difference in the ΔE value, the more obvious the above-mentioned yellowing of the transparent piezoelectric film. Change is suppressed. The difference between the above-mentioned required environment, required time, and optical characteristic values such as ΔE value can be appropriately determined according to the application of the transparent piezoelectric laminate film. Such a color difference can be measured based on the well-known method described in JIS Z8722 using a spectrophotometer or a spectrophotometer. In addition, in the present embodiment, the ΔE value is calculated by the following formula. ΔE represents color difference. ΔL * represents the difference between the L * values before and after the placement, Δa * represents the difference between the a * values before and after the placement, and Δb * represents the difference between the b * values before and after the placement.
[式] ΔE={(ΔL *) 2+(Δa *) 2+(Δb *) 2} 0.5 [Formula] ΔE={(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2 } 0.5
本實施方式之透明壓電積層膜之如上述之光學特性亦可於與其用途相應之適當環境下進行測定。例如於汽車導航系統或者智慧型手機之液晶觸控面板之用途時，要求於特定之高溫高濕環境下之耐變色性。就實現此種用途中之光學特性之穩定性的觀點而言，於85℃85%RH之環境下放置300小時後之透明壓電積層膜之L *值較佳為85以上，a *值較佳為3以下，b *值較佳為4以下。而且，透明壓電積層膜於高溫高濕環境下放置300小時後之ΔE較佳為4.0以下，更佳為3.5以下，進一步較佳為2.5以下時，可判斷於觸控面板之用途中在高濕熱環境下具有充分之耐久性。 The above-mentioned optical properties of the transparent piezoelectric laminated film of the present embodiment can also be measured in an appropriate environment according to the application. For example, when it is used in a car navigation system or a liquid crystal touch panel of a smart phone, it is required to be resistant to discoloration under a specific high temperature and high humidity environment. From the viewpoint of realizing the stability of optical properties in such applications, the L * value of the transparent piezoelectric laminated film after being left at 85°C and 85%RH for 300 hours is preferably 85 or more, and the a * value is higher than It is preferably 3 or less, and the b * value is preferably 4 or less. In addition, when the transparent piezoelectric laminate film is left in a high temperature and high humidity environment for 300 hours, ΔE is preferably 4.0 or less, more preferably 3.5 or less, and further preferably 2.5 or less, it can be judged that the touch panel is used for high-end applications. Sufficient durability in hot and humid environments.
另外，本發明之實施方式中，亦可採用透明壓電膜與透明塗佈層之積層物之物性值來代替透明壓電積層膜之物性值。透明壓電積層膜之物性值於實用上可根據用途而決定。該積層物之物性值只要為根據該用途，於透明壓電積層膜之物性值上加上透明黏著劑層之影響所得的值即可，根據物性不同，可與透明壓電積層膜之物性值相同，亦可為加上透明黏著劑層之影響之不同值。同樣地，亦可採用透明壓電膜單獨之物性值來代替透明壓電積層膜之物性值，加上透明塗佈層及透明黏著劑層之影響而決定該透明壓電膜單獨之物性值。另外，本實施方式之透明壓電積層膜進一步具有除透明壓電膜、透明塗佈層及透明黏著劑層以外之其他構成時，物性值之測定對象可根據透明壓電積層膜之用途而決定。例如，將具備與透明黏著劑層抵接且可剝離之脫模層之透明壓電積層膜於剝離該脫模層後予以實際使用時，可測定自透明壓電積層膜剝離脫模層後之形態下之物性值。 [製法] In addition, in the embodiment of the present invention, the physical property values of the laminate of the transparent piezoelectric film and the transparent coating layer may be used instead of the physical property values of the transparent piezoelectric laminate film. The physical properties of the transparent piezoelectric multilayer film can be practically determined according to the application. The physical property value of the laminate may be obtained by adding the influence of the transparent adhesive layer to the physical property value of the transparent piezoelectric laminate film according to the intended application. Similarly, it can also be a different value with the influence of the transparent adhesive layer added. Similarly, the physical properties of the transparent piezoelectric film alone can be used instead of the physical properties of the transparent piezoelectric laminated film, and the effects of the transparent coating layer and the transparent adhesive layer are added to determine the physical properties of the transparent piezoelectric film alone. In addition, when the transparent piezoelectric laminated film of the present embodiment further has other structures than the transparent piezoelectric film, the transparent coating layer and the transparent adhesive layer, the measurement object of the physical property value can be determined according to the application of the transparent piezoelectric laminated film . For example, when a transparent piezoelectric laminate film having a peelable mold release layer in contact with the transparent adhesive layer is actually used after peeling off the mold release layer, it is possible to measure the amount of time after peeling the mold release layer from the transparent piezoelectric laminate film. The physical value of the form. [production method]
本實施方式之透明壓電積層膜除了使用前述膜形成前述層以外，可與公知之透明壓電積層膜同樣地製造。例如，該透明壓電積層膜可藉由依序分別重疊透明壓電膜、透明塗佈層及透明黏著層而製造。或者，該透明壓電積層膜可藉由在透明壓電膜之表面形成透明塗佈層，於透明塗佈層之表面形成透明黏著劑層而製造。或者，該透明壓電積層膜可藉由在透明壓電膜之表面形成透明塗佈層，於透明塗佈層之表面貼合（例如形成於脫模膜上之）透明黏著劑層而製造。The transparent piezoelectric laminated film of the present embodiment can be produced in the same manner as a known transparent piezoelectric laminated film, except that the above-mentioned film is used to form the above-mentioned layers. For example, the transparent piezoelectric laminated film can be produced by sequentially stacking a transparent piezoelectric film, a transparent coating layer, and a transparent adhesive layer, respectively. Alternatively, the transparent piezoelectric laminated film can be produced by forming a transparent coating layer on the surface of the transparent piezoelectric film, and forming a transparent adhesive layer on the surface of the transparent coating layer. Alternatively, the transparent piezoelectric laminated film can be produced by forming a transparent coating layer on the surface of the transparent piezoelectric film, and attaching a transparent adhesive layer (eg, formed on a release film) to the surface of the transparent coating layer.
透明塗佈層可藉由將用於形成透明塗佈層之塗料塗佈於透明壓電膜之步驟、及使利用該塗佈步驟所形成之塗膜固化之步驟而製造。該塗佈塗料之步驟可採用公知之塗佈方法來實施。塗佈方法之示例中包含噴塗、輥塗、模嘴塗佈、氣刀塗佈、刮刀塗佈、旋塗、逆向塗佈、凹版塗佈及蒸鍍。該塗膜之厚度可藉由塗佈次數或塗料之黏度來適當調整。The clear coating layer can be produced by the step of applying the coating material for forming the clear coating layer to the transparent piezoelectric film, and the step of curing the coating film formed by the coating step. The step of coating the coating can be carried out by a known coating method. Examples of coating methods include spray coating, roll coating, die coating, air knife coating, knife coating, spin coating, reverse coating, gravure coating, and evaporation. The thickness of the coating film can be properly adjusted by the coating times or the viscosity of the coating.
固化步驟可採用使上述塗料之塗膜固化之公知方法來實施。固化方法之示例中包含乾燥、加熱或利用基於光照射之聚合之固化。其中，就適於在物體表面進行加工之觀點及防止各層熱變形之觀點而言，較佳為利用基於紫外線（UV）照射等光照射之聚合之固化。例如，透明塗佈層可藉由塗佈上述塗料後，利用加熱去除塗料中之溶劑，然後利用UV照射使塗膜固化而形成。於藉由UV照射形成透明塗佈層時，就防止氧妨礙固化之觀點而言，該UV照射較佳為於惰性環境下進行。The curing step can be carried out by a known method for curing the coating film of the above-mentioned coating material. Examples of curing methods include drying, heating, or curing using light irradiation-based polymerization. Among them, curing by polymerization by light irradiation such as ultraviolet (UV) irradiation is preferable from the viewpoint of being suitable for processing on the surface of an object and preventing thermal deformation of each layer. For example, the clear coating layer can be formed by applying the above-mentioned coating material, removing the solvent in the coating material by heating, and then curing the coating film by UV irradiation. When the transparent coating layer is formed by UV irradiation, the UV irradiation is preferably performed in an inert environment from the viewpoint of preventing oxygen from hindering curing.
透明塗佈層用上述塗料可含有聚合物，亦可含有單體，亦可含有該等兩者。另外，上述塗料中，可讓聚合物含有會引起固化之交聯結構，亦可進一步含有具有多個交聯結構之低分子化合物。此外，該塗料可視需要適當含有用於讓該聚合反應發生之聚合起始劑等用於固化之添加劑。The said coating material for clear coat layers may contain a polymer, a monomer, or both of these may be contained. In addition, in the above-mentioned coating material, the polymer may contain a cross-linked structure that causes curing, and may further contain a low-molecular-weight compound having a plurality of cross-linked structures. In addition, the coating material may appropriately contain additives for curing, such as a polymerization initiator for causing the polymerization reaction to occur, as required.
另外，透明塗佈層可藉由將透明壓電膜與透明塗佈層共擠出成形而與透明壓電膜同時製造。In addition, the transparent coating layer can be produced simultaneously with the transparent piezoelectric film by co-extruding the transparent piezoelectric film and the transparent coating layer.
透明黏著劑層可藉由將透明黏著劑塗佈於透明塗佈層而製作。此種塗佈可藉由如前述之公知塗佈方法而實施。視需要亦可使塗佈透明黏著劑所形成之塗膜固化。該固化可藉由利用加熱等之乾燥而實施。或者，透明黏著劑層亦可如上所述將製作完成之透明黏著劑之膜貼合於透明塗佈層而製造。The transparent adhesive layer can be produced by coating the transparent adhesive on the transparent coating layer. Such coating can be carried out by a known coating method as described above. If necessary, the coating film formed by coating the transparent adhesive can also be cured. This curing can be implemented by drying by heating or the like. Alternatively, the transparent adhesive layer can also be produced by laminating the completed transparent adhesive film to the transparent coating layer as described above.
以下，使用圖對本發明之實施方式進行說明。如圖1所示，本發明之一實施方式之透明壓電積層膜10係依序直接重疊透明壓電膜1、透明塗佈層2及透明黏著劑層3而構成。Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1 , a transparent piezoelectric
透明壓電膜1如上所述為氟樹脂製，例如可為藉由氟樹脂材料之延伸與極化處理而獲得之膜。透明塗佈層2例如為前述(甲基)丙烯酸酯樹脂製，且重疊於透明壓電膜1之其中一表面上。透明黏著劑層3例如為前述丙烯酸樹脂系黏著劑，且重疊於透明塗佈層2中與透明壓電膜1為相反側之表面上。透明壓電積層膜10藉由經由透明黏著劑層3黏接於其他構成部件，而可供於觸控面板等之壓力感測器。The transparent
另外，如圖2所示，本發明之另一實施方式之透明壓電積層膜20係依序直接重疊透明壓電膜1、透明塗佈層2及透明黏著劑層3而構成。透明壓電積層膜20中，透明塗佈層2及透明黏著劑層3均分別配置於透明壓電膜1之兩面側。即，於透明壓電膜1之其中一表面上重疊有透明塗佈層2a，於透明壓電膜1之另一表面上重疊有透明塗佈層2b。另外，於透明塗佈層2a之表面上重疊有透明黏著劑層3a，於透明塗佈層2b之表面上重疊有透明黏著劑層3b。透明壓電積層膜20亦與透明壓電積層膜10同樣地藉由將透明黏著劑層3a、3b分別黏接於其他層，而可供於觸控面板等之壓力感測器中之積層結構之一部分。
[觸控面板]
In addition, as shown in FIG. 2 , the transparent
本發明之一實施方式之觸控面板具有前述本實施方式之透明壓電積層膜。該觸控面板中之透明壓電積層膜之位置及個數可根據觸控面板之用途或所需功能而適當決定。圖3係示意性表示本發明之實施方式之觸控面板中之層構成之一例的圖。A touch panel according to an embodiment of the present invention includes the above-described transparent piezoelectric laminate film of this embodiment. The position and number of the transparent piezoelectric laminated films in the touch panel can be appropriately determined according to the application or required function of the touch panel. FIG. 3 is a diagram schematically showing an example of a layer configuration in the touch panel according to the embodiment of the present invention.
如圖3所示，觸控面板100具有由透明電極4b與覆蓋玻璃5夾著圖2所示之透明壓電積層膜20而成的構成。此外，於透明壓電積層膜20與覆蓋玻璃5之間，自透明壓電積層膜20朝向覆蓋玻璃5依序重疊配置有透明基板6a、透明電極4a、透明黏著劑層3c、透明基板6c、透明電極4c、透明黏著劑層3d。而且，於透明壓電積層膜20與透明電極4b之間配置有透明基板6b。如上所述，觸控面板100係依序重疊透明電極4b、透明壓電積層膜20及覆蓋玻璃5而構成。於實際使用觸控面板100時，可於顯示器30之表面重疊配置觸控面板100之透明電極4b側之表面，但並不限定於此。As shown in FIG. 3 , the
透明壓電積層膜20與覆蓋玻璃5隔著透明黏著劑層3c、3d、透明電極4a、4c以及透明基板6a、6c而由透明黏著劑層3a黏接，透明壓電積層膜20與透明電極4b隔著透明基板6b而由透明黏著劑層3b黏接。另外，可於透明電極4b之積層方向上之透明壓電積層膜20之相反側，配置有機EL（Electroluminescence，電致發光）顯示面板或液晶顯示面板等顯示面板、即顯示器30。顯示器30可採用以往公知之顯示面板，因此本說明書中省略其詳細構成之說明。The transparent
透明電極4a、4b、4c可分別形成於透明基板6a、6b、6c上，與透明基板6a、6b、6c一起黏接於觸控面板100中之所需層，亦可直接形成於積層方向上透明電極4a、4b、4c所要鄰接之其他層之表面，由透明黏著劑層3a、3b、3c或3d黏接。The
透明電極4a、4b、4c可採用能用於觸控面板之公知之透明電極。更詳細而言，透明電極4a、4b、4c只要為實質上透明之面狀電極即可，可為具有圖案之導電性薄膜，亦可為極細之導電性線材所形成之平面結構。構成透明電極4a、4b、4c之材料並無限定，適宜使用選自由In、Sn、Zn、Ga、Sb、Ti、Si、Zr、Mg、Al、Au、Ag、Cu、Pd、W所組成之群中之至少一種金屬之金屬氧化物。該金屬氧化物中亦可視需要進一步含有上述群中所示之金屬原子。該金屬氧化物較佳為使用銦-錫複合氧化物(ITO)、銻-錫複合氧化物(ATO)等，尤佳為使用ITO。透明電極4a、4b、4c之其他代表性材料之示例中，包含銀奈米線、銀網格、銅網格、石墨烯及奈米碳管。透明基板6a、6b、6c可採用能作為支持上述透明電極4a、4b、4c之基底使用的公知的透明膜。構成透明基板6a、6b、6c之材料並無限定，適宜使用聚對苯二甲酸乙二酯(PET)、聚碳酸酯(PC)、環烯烴聚合物(COP)。As the
覆蓋玻璃5為觸控面板之覆蓋玻璃。只要為觸控面板用片狀透光部件即可，可為如覆蓋玻璃5之類的玻璃板，亦可為透明樹脂片。The
本發明之實施方式之觸控面板亦可於獲得本實施方式之效果之範圍內進一步包含其他構成。The touch panel of the embodiment of the present invention may further include other structures within the scope of obtaining the effects of the embodiment.
另外，本發明之實施方式之觸控面板只要於積層結構中包含前述本發明之實施方式之透明壓電積層膜即可。該觸控面板中之該透明壓電積層膜於積層方向上之位置可於獲得本發明之實施方式之效果之範圍內適當決定。In addition, the touch panel of the embodiment of the present invention only needs to include the transparent piezoelectric laminated film of the embodiment of the present invention in the laminate structure. The position of the transparent piezoelectric laminated film in the touch panel in the lamination direction can be appropriately determined within the range in which the effects of the embodiments of the present invention are obtained.
另外，本發明之實施方式之觸控面板亦可具有如下構成：在GFF（Glass-Film-Film，玻璃雙薄膜）型或GF2（Glass/DITO Film，單片雙層ITO薄膜）型等習知觸控面板中之積層結構中，適當追加本實施方式之透明壓電積層膜。此時，於本實施方式之透明壓電積層膜上，可直接積層用於檢測壓力之透明電極層及用於檢測位置之位置感測器，亦可經由黏著劑層來黏接。具有此種構成之觸控面板可於習知觸控面板之功能上進一步表現出由透明壓電積層膜所產生之功能，例如可構成透明之積層結構中包含位置感測器與壓力感測器兩者之觸控面板。In addition, the touch panel according to the embodiment of the present invention may also have the following structure: a conventional GFF (Glass-Film-Film, glass double film) type or GF2 (Glass/DITO Film, single-layer double-layer ITO film) type, etc. In the laminated structure of the touch panel, the transparent piezoelectric laminated film of this embodiment is appropriately added. At this time, on the transparent piezoelectric laminated film of this embodiment, a transparent electrode layer for pressure detection and a position sensor for position detection may be directly laminated, or may be bonded via an adhesive layer. The touch panel with such a structure can further exhibit the function produced by the transparent piezoelectric laminate film in addition to the functions of the conventional touch panel, for example, the transparent laminate structure can include a position sensor and a pressure sensor Both touch panels.
另外，本實施方式之觸控面板之製造中，透明黏著劑層不僅可形成於透明塗佈層上，亦可形成於要經由透明黏著劑層而與透明塗佈層黏接之其他層上。此時，透明黏著劑層可位於透明塗佈層側，亦可不在此側。 [作用效果] In addition, in the manufacture of the touch panel of this embodiment, the transparent adhesive layer may be formed not only on the transparent coating layer, but also on other layers to be bonded to the transparent coating layer through the transparent adhesive layer. At this time, the transparent adhesive layer may or may not be located on the side of the transparent coating layer. [Effect]
如上所述，本發明之實施方式之透明壓電積層膜可由氟樹脂製透明壓電膜、透明塗佈層及透明黏著劑層構成。具有如上述之構成之透明壓電積層膜除了表現出基於透明壓電膜之充分之壓電性與源於透明黏著劑層之黏著性以外，亦可抑制透明壓電膜之經時變色，可長時間表現充分之透明性。As described above, the transparent piezoelectric laminated film according to the embodiment of the present invention may be composed of a transparent piezoelectric film made of a fluororesin, a transparent coating layer, and a transparent adhesive layer. The transparent piezoelectric multilayer film having the above-mentioned constitution can not only exhibit sufficient piezoelectricity due to the transparent piezoelectric film and adhesiveness derived from the transparent adhesive layer, but also suppress the discoloration of the transparent piezoelectric film over time, and can Full transparency for a long time.
如上所述，該透明壓電積層膜可表現出穩定之透明性，且因僅由樹脂等有機層構成，所以可使具有此種充分透明性之壓力感測器之整體之層厚度進一步變薄。因此，該透明壓電積層膜可作為壓力感測器配置於較前述顯示面板更靠表面（圖像顯示面）側。藉此，可較以往簡化觸控面板之層構成，或者使觸控面板整體之層厚度變薄，而且可提高觸控面板中之透明壓電積層膜之配置數及配置部位之自由度。 [總結] As described above, the transparent piezoelectric multilayer film can exhibit stable transparency, and since it is composed of only organic layers such as resin, the overall layer thickness of the pressure sensor having such sufficient transparency can be further reduced . Therefore, the transparent piezoelectric laminated film can be arranged on the surface (image display surface) side as a pressure sensor than the aforementioned display panel. Thereby, the layer structure of the touch panel can be simplified, or the thickness of the entire touch panel can be reduced, and the number of arrangement and the degree of freedom of arrangement positions of the transparent piezoelectric laminated films in the touch panel can be improved. [Summarize]
根據以上說明可知，本發明之實施方式之透明壓電積層膜係依序重疊氟樹脂製透明壓電膜、具有0.20 µm以上之厚度之透明塗佈層、及透明黏著劑層而構成。而且，本發明之實施方式之觸控面板具有該透明壓電積層膜。因此，該透明壓電積層膜及觸控面板均可防止具有氟樹脂製透明壓電膜之透明壓電積層膜中之透明壓電膜變色。As can be seen from the above description, the transparent piezoelectric laminated film according to the embodiment of the present invention is formed by sequentially stacking a transparent piezoelectric film made of fluororesin, a transparent coating layer having a thickness of 0.20 µm or more, and a transparent adhesive layer. Further, the touch panel according to the embodiment of the present invention has the transparent piezoelectric laminate film. Therefore, both the transparent piezoelectric laminate film and the touch panel can prevent discoloration of the transparent piezoelectric film in the transparent piezoelectric laminate film having the fluororesin transparent piezoelectric film.
本發明之實施方式中，就實現抑制透明壓電膜之變色及表現充分之壓電特性之觀點而言，更有效的是透明塗佈層之厚度為4.0 µm以下。In the embodiment of the present invention, from the viewpoint of suppressing discoloration of the transparent piezoelectric film and exhibiting sufficient piezoelectric properties, it is more effective that the thickness of the transparent coating layer is 4.0 µm or less.
本發明之實施方式中，就實現透明壓電積層膜之充分之透明性及抑制透明壓電膜之變色的觀點而言，更有效的是透明塗佈層為(甲基)丙烯酸酯樹脂製。In the embodiment of the present invention, it is more effective that the transparent coating layer is made of (meth)acrylate resin from the viewpoints of achieving sufficient transparency of the transparent piezoelectric multilayer film and suppressing discoloration of the transparent piezoelectric film.
本發明之實施方式中，就表現出透明塗佈層對黏接面之充分黏接力的觀點及降低成本之觀點而言，更有效的是透明黏著劑層含有丙烯酸樹脂系黏著劑。In the embodiment of the present invention, it is more effective that the transparent adhesive layer contains an acrylic resin-based adhesive from the viewpoint of expressing sufficient adhesive force of the clear coating layer to the adhesive surface and the viewpoint of cost reduction.
本發明之實施方式中，就於觸控面板之用途中實現高濕熱環境下充分之耐久性之觀點而言，更有效的是透明壓電積層膜於85℃85%RH之環境下放置300小時後之ΔE為4.0以下。In the embodiment of the present invention, it is more effective to leave the transparent piezoelectric laminate film in an environment of 85°C and 85%RH for 300 hours from the viewpoint of achieving sufficient durability in a high-humidity heat environment for use in a touch panel. After that, ΔE was 4.0 or less.
本發明之實施方式中，就實現兩面側具有透明黏著劑層且透明黏著劑層分別黏接於其他層之透明壓電積層膜的觀點而言，更有效的是透明塗佈層及透明黏著劑層均分別配置於透明壓電膜之兩面側。In the embodiment of the present invention, from the viewpoint of realizing a transparent piezoelectric laminated film having transparent adhesive layers on both sides and the transparent adhesive layers are respectively adhered to other layers, the transparent coating layer and the transparent adhesive are more effective. The layers are respectively arranged on both sides of the transparent piezoelectric film.
本發明並不限定於上述各實施方式，可於申請專利範圍所示之範圍內進行各種變更。適當組合不同實施方式中分別公示之技術性手段後獲得之實施方式亦包含於本發明之技術性範圍內。 實施例 [實施例1] The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Example [Example 1]
將厚度為140 µm之聚偏二氟乙烯（KUREHA股份有限公司製造）之片材以延伸倍率成為4.2倍之方式延伸。對延伸過之片材施加直流電壓並自0 kV增加至11.8 kV而進行極化處理。如此，獲得厚度為40 µm之透明壓電膜。A sheet of polyvinylidene fluoride (manufactured by Kureha Co., Ltd.) having a thickness of 140 µm was stretched so that the stretching ratio became 4.2 times. Polarization was performed by applying a DC voltage to the stretched sheet and increasing it from 0 kV to 11.8 kV. In this way, a transparent piezoelectric film with a thickness of 40 µm was obtained.
其次，於130℃對獲得之透明壓電膜進行1分鐘熱處理。利用棒式塗佈機，於熱處理過之透明壓電膜之單面塗佈硬塗劑（「BS CH271」（荒川化學工業股份有限公司製造）），於80℃使之乾燥2分鐘。上述硬塗劑為丙烯酸系硬塗劑，且具有UV固化性。Next, the obtained transparent piezoelectric film was heat-treated at 130°C for 1 minute. A hard coat agent ("BS CH271" (manufactured by Arakawa Chemical Industry Co., Ltd.)) was applied to one side of the heat-treated transparent piezoelectric film using a bar coater, and dried at 80°C for 2 minutes. The said hard coat agent is an acrylic hard coat agent, and has UV curability.
然後，使用UV照射裝置CSOT-40（GS Yuasa股份有限公司製造），以400 mJ/cm 2之累計光量對硬塗劑乾燥而成之塗膜照射UV。如此，獲得單面包含具有後述表中所記載之厚度之透明塗佈層的膜。藉由對透明壓電膜之相反側之面進行同樣之操作，而獲得透明壓電膜之兩面包含透明塗佈層之透明塗佈膜。 Then, the coating film formed by drying the hard coating agent was irradiated with UV at a cumulative light intensity of 400 mJ/cm 2 using a UV irradiation apparatus CSOT-40 (manufactured by GS Yuasa Co., Ltd.). In this way, a film including a transparent coating layer having a thickness described in the table below on one side was obtained. By performing the same operation on the surface on the opposite side of the transparent piezoelectric film, a transparent coating film including a transparent coating layer on both sides of the transparent piezoelectric film was obtained.
然後，使用HALDER Laminator MRK-650Y型（MCK股份有限公司製造），於貼合壓力0.2 MPa、貼合速度1.0 m/min之條件下將丙烯酸系光學黏著片（「LUCIACS CS9827US」，日東電工股份有限公司製造，「LUCIACS」為該公司之註冊商標）貼合於透明塗佈膜之兩面。如此，獲得透明壓電積層膜。亦將使用該光學黏著片之透明壓電積層膜稱為「丙烯酸系1」。
[實施例2~4、比較例4]
Then, using HALDER Laminator MRK-650Y type (manufactured by MCK Co., Ltd.), under the conditions of a bonding pressure of 0.2 MPa and a bonding speed of 1.0 m/min, an acrylic optical adhesive sheet ("LUCIACS CS9827US", Nitto Denko Co., Ltd. It is manufactured by the company, "LUCIACS" is the registered trademark of the company) and is attached to both sides of the transparent coating film. In this way, a transparent piezoelectric laminated film was obtained. The transparent piezoelectric laminated film using this optical adhesive sheet is also called "
除了以具有後述表中所記載之厚度之方式形成透明塗佈層以外，以與實施例1同樣之方式分別獲得透明塗佈層之厚度不同之透明壓電積層膜。 [實施例5] Except having formed the transparent coating layer so that it may have the thickness described in the following table|surface, it carried out similarly to Example 1, and obtained the transparent piezoelectric laminated film which the thickness of the transparent coating layer differs, respectively. [Example 5]
除了將光學黏著片變更為其他丙烯酸系光學黏著片（「NNX75M」，Gunze股份有限公司製造）以外，以與實施例1同樣之方式獲得透明壓電積層膜。亦將使用該光學黏著片之透明壓電積層膜稱為「丙烯酸系2」。
[實施例6]
A transparent piezoelectric laminated film was obtained in the same manner as in Example 1, except that the optical adhesive sheet was changed to another acrylic optical adhesive sheet ("NNX75M", manufactured by Gunze Co., Ltd.). The transparent piezoelectric laminated film using this optical adhesive sheet is also called "
除了使極化處理之直流電壓自0 kV增加至11.0 kV來代替自0 kV增加至11.8 kV，以及將硬塗劑變更為「Lioduras TYAB-M101」（Toyochem股份有限公司製造，「Lioduras」為東洋油墨SC控股股份有限公司之註冊商標）而形成具有後述表中所記載之厚度之透明塗佈層以外，以與實施例1同樣之方式獲得丙烯酸系1之透明壓電積層膜。
[實施例7、8]
In addition to increasing the polarized DC voltage from 0 kV to 11.0 kV instead of 0 kV to 11.8 kV, and changing the hard coating agent to "Lioduras TYAB-M101" (manufactured by Toyochem Co., Ltd., "Lioduras" is Toyo Ink SC Holdings Co., Ltd. registered trademark), except that the transparent coating layer having the thickness described in the table below was formed in the same manner as in Example 1 to obtain a transparent piezoelectric laminated film of
除了將具有1.0 µm之厚度之透明塗佈層形成於透明壓電膜之單面，且實施例7中將具有4.0 µm之厚度之透明塗佈層形成於相反側之面，實施例8中將具有10.0 µm之厚度之透明塗佈層形成於相反側之面以外，以與實施例1同樣之方式分別獲得配置於透明壓電膜之兩面之透明塗佈層之厚度互不相同的透明壓電積層膜。 [比較例1~3] Except for forming a transparent coating layer with a thickness of 1.0 µm on one side of the transparent piezoelectric film, and forming a transparent coating layer with a thickness of 4.0 µm on the opposite side in Example 7, in Example 8, the A transparent coating layer having a thickness of 10.0 µm was formed on the surface other than the opposite side, and in the same manner as in Example 1, transparent piezoelectric films were obtained in which the thicknesses of the transparent coating layers arranged on both sides of the transparent piezoelectric film were different from each other. Laminated film. [Comparative Examples 1 to 3]
除了不塗佈硬塗劑以外，以分別與實施例1、5及6同樣之方式分別獲得作為比較例之透明壓電積層膜。 [評估] [透明塗佈層之厚度] Except not applying the hard coating agent, transparent piezoelectric laminated films as comparative examples were obtained in the same manner as in Examples 1, 5, and 6, respectively. [Evaluate] [Thickness of transparent coating layer]
將前述實施例及比較例4之透明壓電積層膜分別包埋於環氧樹脂中，且以透明壓電積層膜之截面露出之方式將環氧樹脂塊切斷。使用掃描式電子顯微鏡（「SU3800」，日立高新技術股份有限公司製造），於加速電壓3.0 kV、倍率50000倍之條件下對露出之透明壓電積層膜之截面進行觀察，而測定透明壓電積層膜中之透明塗佈層之厚度。The transparent piezoelectric laminate films of the foregoing Example and Comparative Example 4 were embedded in epoxy resins, respectively, and the epoxy resin block was cut so that the cross-section of the transparent piezoelectric laminate films was exposed. Using a scanning electron microscope ("SU3800", manufactured by Hitachi High-Tech Co., Ltd.), the section of the exposed transparent piezoelectric laminate film was observed under the conditions of an accelerating voltage of 3.0 kV and a magnification of 50,000 times, and the transparent piezoelectric laminate was measured. The thickness of the clear coating layer in the film.
另外，於透明塗佈層之厚度之測定中，測定該透明塗佈層中2處之厚度，將其平均值作為透明塗佈層之厚度。另外，於上述觀察條件下，觀察到透明塗佈層之界面為大致平滑的線，於透明塗佈層之厚度之測定中係測定該線間之距離。 [壓電常數d 33值] In addition, in the measurement of the thickness of the clear coating layer, the thickness of the two places in the clear coating layer was measured, and the average value was taken as the thickness of the clear coating layer. In addition, under the above observation conditions, the interface of the clear coating layer was observed as a substantially smooth line, and the distance between the lines was measured in the measurement of the thickness of the clear coating layer. [piezoelectric constant d 33 value]
關於實施例及比較例4之透明塗佈膜以及比較例1~3之透明壓電膜各自之壓電常數d 33，使用壓電常數測定裝置（「PiezoMeter System PM300」，PIEZOTEST公司製造），以0.2 N夾住樣品，讀取施加0.15 N、110 Hz之力時之產生電荷。壓電常數d 33之實測值根據測定之膜之正反面不同而成為正值或負值，而本說明書中記載絕對值。壓電常數d 33值為6 pC/N以上時，可判斷於觸控面板之用途中無實用上之問題。 The piezoelectric constants d 33 of the transparent coating films of Example and Comparative Example 4 and the transparent piezoelectric films of Comparative Examples 1 to 3 were measured using a piezoelectric constant measuring device (“PiezoMeter System PM300”, manufactured by PIEZOTEST Co., Ltd.). Hold the sample at 0.2 N and read the charge generated when a force of 0.15 N, 110 Hz is applied. The actual measurement value of the piezoelectric constant d 33 is a positive value or a negative value depending on the front and back sides of the film to be measured, and the absolute value is described in this specification. When the piezoelectric constant d 33 value is 6 pC/N or more, it can be judged that there is no practical problem in the application of the touch panel.
另外，透明壓電積層膜之壓電特性中之透明壓電膜之影響最強，該壓電特性中之透明黏著劑層之影響與透明壓電膜及透明塗佈層所產生之影響相比足夠小，因此利用透明塗佈膜之壓電特性，可驗證透明壓電積層膜之壓電特性。 [全光線透過率] In addition, the transparent piezoelectric film has the strongest influence on the piezoelectric properties of the transparent piezoelectric laminated film, and the influence of the transparent adhesive layer in the piezoelectric properties is sufficient compared with the influence of the transparent piezoelectric film and the transparent coating layer. Therefore, the piezoelectric properties of the transparent piezoelectric laminated film can be verified by using the piezoelectric properties of the transparent coating film. [Total light transmittance]
使用霧度計（「NDH7700SP II」，日本電色工業股份有限公司製造），基於JIS K7361-1中記載之方法測定實施例及比較例4中所使用之透明塗佈膜以及比較例1~3中所使用之透明壓電膜各自之全光線透過率。全光線透過率為80%以上時，可判斷於觸控面板之用途中無實用上之問題。Using a haze meter ("NDH7700SP II", manufactured by Nippon Denshoku Kogyo Co., Ltd.), the transparent coating films used in Example and Comparative Example 4 and Comparative Examples 1 to 3 were measured based on the method described in JIS K7361-1 The total light transmittance of each transparent piezoelectric film used in the When the total light transmittance is more than 80%, it can be judged that there is no practical problem in the application of the touch panel.
另外，透明壓電積層膜之透光性中之透明黏著劑層之影響與透明壓電膜及透明塗佈層所產生之影響相比足夠小，因此利用透明塗佈膜之透光性，可驗證透明壓電積層膜之透光性。 [霧度值] In addition, the influence of the transparent adhesive layer in the light transmittance of the transparent piezoelectric laminated film is sufficiently small compared to the influence of the transparent piezoelectric film and the transparent coating layer. Therefore, the light transmittance of the transparent coating film can be used. Verify the light transmittance of the transparent piezoelectric laminated film. [Haze value]
使用霧度計（「NDH7700SP II」，日本電色工業股份有限公司製造），基於JIS K7136中記載之方法測定實施例及比較例4中所使用之透明塗佈膜以及比較例1~3中所使用之透明壓電膜各自之霧度值。霧度值為1.5以下時，可判斷於觸控面板之用途中無實用上之問題。 [L *值、a *值、b *值] Using a haze meter ("NDH7700SP II", manufactured by Nippon Denshoku Kogyo Co., Ltd.), the transparent coating films used in Examples and Comparative Examples 4 and those in Comparative Examples 1 to 3 were measured based on the method described in JIS K7136. The haze value of each transparent piezoelectric film used. When the haze value is 1.5 or less, it can be judged that there is no practical problem in the use of the touch panel. [L * value, a * value, b * value]
使用分光色彩計（「SE7700」，日本電色工業股份有限公司製造），利用依據JIS Z8722之方法測定實施例及比較例4中所使用之透明塗佈膜以及比較例1~3中所使用之透明壓電膜各自於L *a *b *表色系中之L *值、a *值及b *值。L *值為85以上時，可判斷於觸控面板之用途中無實用上之問題。a *值為3以下時，可判斷於觸控面板之用途中無實用上之問題。b *值為4以下時，可判斷於觸控面板之用途中無實用上之問題。 [高濕熱環境試驗] Using a spectrophotometer ("SE7700", manufactured by Nippon Denshoku Kogyo Co., Ltd.), the transparent coating films used in Examples and Comparative Examples 4 and those used in Comparative Examples 1 to 3 were measured by a method according to JIS Z8722. The L * value, a * value and b * value of each transparent piezoelectric film in the L * a * b * colorimetric system. When the L * value is 85 or more, it can be judged that there is no practical problem in the application of the touch panel. When the a * value is 3 or less, it can be judged that there is no practical problem in the application of the touch panel. When the value of b * is 4 or less, it can be judged that there is no practical problem in the application of the touch panel. [High humidity and heat environment test]
將實施例及比較例之透明壓電積層膜分別置於控制為85℃85%RH環境之恆溫恆濕槽（「ECONAS LH34-14M」，Nagano Science股份有限公司製造）內，利用上述方法測定規定時間前及規定時間後之L *值、a *值及b *值。然後，利用下述式算出於上述環境中經過規定時間後之ΔE。下述式中，ΔE表示規定時間後之色差，ΔL *、Δa *、Δb *分別表示高濕熱環境中之規定時間前後之L *、a *、b *之差。另外，上述高濕熱環境試驗係使用如下透明壓電積層膜來實施，該透明壓電積層膜係依序重疊第1脫模層、第1透明黏著劑層、第1透明塗佈層、透明壓電膜、第2透明塗佈層、第2透明黏著劑層及第2脫模層而構成且不具備其他層構成。即，使用如下形態之透明壓電積層膜來實施上述高濕熱環境試驗，該形態具備用作材料之光學黏著片所具備之可剝離的脫模層。另外，因對具備脫模層之形態之透明壓電積層膜測定出之ΔE之值為表中記載之值，所以於以不具備脫模層之形態實際使用透明壓電積層膜時，可判斷為表中記載之值以下之ΔE。 The transparent piezoelectric laminated films of the examples and the comparative examples were placed in a constant temperature and humidity chamber (“ECONAS LH34-14M”, manufactured by Nagano Science Co., Ltd.) controlled to an environment of 85°C and 85% RH, respectively, and the regulation was measured by the above method. L * , a * and b * values before time and after specified time. Then, ΔE after a predetermined time has elapsed in the above-mentioned environment is calculated by the following formula. In the following formula, ΔE represents the color difference after a predetermined time, and ΔL * , Δa * , and Δb * represent the differences between L * , a * , and b * before and after a predetermined time in a high-humidity-heat environment, respectively. In addition, the above-mentioned high-humidity heat environment test was carried out using a transparent piezoelectric laminated film in which a first release layer, a first transparent adhesive layer, a first transparent coating layer, a transparent pressure The electric film, the second transparent coating layer, the second transparent adhesive layer, and the second mold release layer are constituted and are not constituted by other layers. That is, the above-mentioned high-humidity heat environment test was implemented using the transparent piezoelectric laminated film of the form provided with the peelable mold release layer with which the optical adhesive sheet used as a material is equipped. In addition, since the value of ΔE measured for the transparent piezoelectric laminated film with the release layer is the value described in the table, it can be judged when the transparent piezoelectric laminated film is actually used in the form without the release layer. It is ΔE below the value described in the table.
[式] ΔE={(ΔL *) 2+(Δa *) 2+(Δb *) 2} 0.5 [Formula] ΔE={(ΔL * ) 2 +(Δa * ) 2 +(Δb * ) 2 } 0.5
上述評估結果如表1~表3所示。表1及表3中之L *值、a *值及b *值為於上述高濕熱環境試驗中經過300小時後之值，ΔE為300小時之該高濕熱環境試驗前後之色差之值。此外，圖4表示實施例2、4之透明壓電積層膜及比較例1之透明壓電積層膜的高濕熱環境試驗之試驗時間與色差ΔE之關係。經過時間為300小時且ΔE為4.0以下時，可判斷於觸控面板之用途中在高濕熱環境下具有充分之耐久性。 The above evaluation results are shown in Tables 1 to 3. The L * value, a * value and b * value in Table 1 and Table 3 are the values after 300 hours in the above-mentioned high humidity and heat environment test, and ΔE is the value of the color difference before and after the 300 hour high humidity heat environment test. 4 shows the relationship between the test time and the color difference ΔE in the high-humidity heat environment test of the transparent piezoelectric laminated films of Examples 2 and 4 and the transparent piezoelectric laminated film of Comparative Example 1. When the elapsed time is 300 hours and ΔE is 4.0 or less, it can be judged that the touch panel has sufficient durability under a high humidity and heat environment.
表1
表2
表3
實施例1~6之透明壓電積層膜均於高濕熱環境下亦具有足夠高之透明性，且變色足夠少，具有上述高濕熱環境中之充分之耐久性。認為其原因在於，透明塗佈層直接介隔在透明壓電膜與光學黏著片之間，因此充分抑制了會使透明壓電膜變色之光學黏著片中之成分對透明壓電膜的作用。The transparent piezoelectric laminated films of Examples 1 to 6 all have sufficiently high transparency in a high-humidity-heat environment, and sufficiently little discoloration, and have sufficient durability in the above-mentioned high-humidity-heat environment. The reason for this is considered to be that the transparent coating layer is directly interposed between the transparent piezoelectric film and the optical adhesive sheet, thereby sufficiently suppressing the effect of the components in the optical adhesive sheet that would discolor the transparent piezoelectric film on the transparent piezoelectric film.
相對於此，比較例1~3之透明壓電積層膜均與實施例1~6之透明壓電積層膜相比在高濕熱環境下之經時變色（黃變）顯著。認為其原因在於，光學黏著片黏接於透明壓電膜，因此會使透明壓電膜變色之光學黏著片中之成分作用於透明壓電膜。On the other hand, all the transparent piezoelectric laminated films of Comparative Examples 1 to 3 exhibited remarkable discoloration (yellowing) over time in a high-humidity heat environment compared with the transparent piezoelectric laminated films of Examples 1 to 6. The reason for this is considered to be that the optical adhesive sheet is adhered to the transparent piezoelectric film, so that the components in the optical adhesive sheet that discolor the transparent piezoelectric film act on the transparent piezoelectric film.
另外，比較例4中使用之透明塗佈層與實施例1~6之透明塗佈層相比，霧度值高。認為其原因在於，透明塗佈層之厚度薄，無法充分覆蓋透明壓電膜之表面，因此製造中之損傷防止作用不充分。 產業上之可利用性 In addition, the haze value of the clear coating layer used in Comparative Example 4 was higher than that of the clear coating layers of Examples 1 to 6. The reason for this is considered to be that the thickness of the transparent coating layer is too thin to sufficiently cover the surface of the transparent piezoelectric film, so that the effect of preventing damage during production is insufficient. industrial availability
本發明可用於觸控面板。The present invention can be used for touch panels.
1:透明壓電膜
2、2a、2b:透明塗佈層
3、3a、3b、3c、3d:透明黏著劑層
4a、4b、4c:透明電極
5:覆蓋玻璃
6a、6b、6c:透明基板
10、20:透明壓電積層膜
30:顯示器
100:觸控面板
1: Transparent
［圖1］係示意性表示本發明之一實施方式之透明壓電積層膜之層構成的圖。 ［圖2］係示意性表示本發明之另一實施方式之透明壓電積層膜之層構成的圖。 ［圖3］係示意性表示本發明之一實施方式之觸控面板之層構成的圖。 ［圖4］係表示本發明之實施例及比較例之透明壓電積層膜分別置於高濕熱環境時之ΔE值的圖表。 1 is a diagram schematically showing a layer structure of a transparent piezoelectric laminated film according to an embodiment of the present invention. [ Fig. 2] Fig. 2 is a diagram schematically showing a layer structure of a transparent piezoelectric multilayer film according to another embodiment of the present invention. FIG. 3 is a diagram schematically showing a layer structure of a touch panel according to an embodiment of the present invention. Fig. 4 is a graph showing the ΔE values of the transparent piezoelectric laminated films of Examples and Comparative Examples of the present invention, respectively, when placed in a high-humidity heat environment.
1:透明壓電膜 1: Transparent piezoelectric film
2:透明塗佈層 2: Transparent coating layer
3:透明黏著劑層 3: Transparent adhesive layer
10:透明壓電積層膜 10: Transparent piezoelectric laminated film
10 10
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